package com.hashnode.controller;

import com.hashnode.lb.LoadBalancer;
import com.hashnode.model.CommonResult;
import com.hashnode.model.Payment;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import javax.annotation.Resource;
import java.net.URI;
import java.util.List;

@RestController
@Slf4j
public class OrderController {

//    public static final String PAYMENT_URL = "http://localhost:8001";
    public static final String PAYMENT_URL = "http://CLOUD-PAYMENT-SERVICE";

    @Autowired
    private RestTemplate restTemplate;

    @Autowired
    private DiscoveryClient discoveryClient;

    @Resource
    private LoadBalancer loadBalancer;

    @GetMapping("/consumer/payment/create")
    public CommonResult<Payment> create(Payment payment){
        return restTemplate.postForObject(PAYMENT_URL+"/payment/create",payment,CommonResult.class);
    }

    @GetMapping("/consumer/payment/get/{id}")
    public CommonResult<Payment> getPayment(@PathVariable("id")Long id){
        return restTemplate.getForObject(PAYMENT_URL+"/payment/get/"+id,CommonResult.class);
    }


//    自定义负载均衡策略
    @GetMapping("/consumer/payment/lb/get/{id}")
    public CommonResult<Payment> getPaymentLB(@PathVariable("id")Long id){
        List<ServiceInstance> instances = discoveryClient.getInstances("CLOUD-PAYMENT-SERVICE");
        if(null == instances || instances.size() <=0 ){
            return null;
        }
        ServiceInstance serviceInstance = loadBalancer.instance(instances);
        URI uri = serviceInstance.getUri();

        return restTemplate.getForObject(uri+"/payment/get/"+id,CommonResult.class);
    }

    // ====================> zipkin+sleuth
    @GetMapping("/consumer/payment/zipkin")
    public String paymentZipkin()
    {
//        String result = restTemplate.getForObject("http://localhost:8001"+"/payment/zipkin/", String.class);
        String result = restTemplate.getForObject(PAYMENT_URL+"/payment/zipkin/", String.class);
        return result;
    }
}
